Exhauster



No. 666,590. Patented Dec. 27, I898. J. M. SEYMOUR, 1R.

EXHAUSTEB.

(Application filed Feb. 1, 1898.

No Model.)

Wituemms Inventor Attor'n (:y

UNiTnn STAT S PATENT FFTCE.

JAMES M. SEYMOUR, JR. OF NEVARK, NEYV JERSEY.

EXHAUSTER.

SPECIFICATION forming part of Letters Patent No. 616,590, dated December27, 1898.

Application filed February 1, 1898. Serial No- 668 7O8. (No model.)

To all whom it may concern:

Beit known that I, J AMES M. SEYMOUR, Jr. a citizen of the UnitedStates, residing at Newark, in the county of Essex and State of NewJersey, have invented a certain new and useful Improvementin Exhausters,of which the following is a specification.

A centrifugal blower used as an exhauster is very efficient in theuptake of a kiln or other furnace or in a chamber properly connectedwith such uptake to promote the draft of the fire in the furnace byacting on the hot gases after they have performed their duties. In suchsituations the exhauster-fan and its adjuncts necessarily assume andmaintain a high temperature.

My invention relates to that class of constructions designed to aid inpreventing the high temperature from being communicated to the bearingsof the exhauster shaft.

I will describe the invention as applied to an overhung shaft carrying alarge and rapidly-revolving exhauster mounted within a brick casing andso conditioned that the exhauster and the immediately adjacent portionof the shaft are red-hot.

I extend through the wall two concentric horizontal pipes, the innermosta little larger in diameter than the shaft, entirely out of contact withthe same and nearly the full length of the overhang, and allow theexternal air to move inward through the annular space between theinnermost and the shaft and also in smaller quantity between theinnermost and the outermost pipes,which maintains the bearing perfectlycool.

The accompanying drawings form a part of this specification andrepresent what I consider the best means of carrying out the invention.

E igure 1 is an elevation, partly in vertical section, showing theentire novel portions of the apparatus. Fig. 2 is a vertical section ofa portion on a larger scale. Fig. 2 is a corresponding section, on asmaller scale, showinga modification.

Similar letters of reference indicate corresponding parts in all thefigures.

A is the brick wall of an exhauster-chamber a, and co the flue throughwhich the hot gases are drawn from a kiln M. It will be understood thatthe hot gases acted on by the pew erful revolutions of the exhauster arethrown out in the ordinary manner through a tangential passage andcaused to flow rapidly up a stack. (Not shown.)

A hole at the point (designated by at opposite to the fine is a littlelarger than the shaft of the exhauster and receives a horizontal pipe Bopen at both ends.

A and A are the pedestals which support the bearings of a shaft D,driven by a belt (not shown) running on a pulley D and having a longoverhung end extending through the pipe B and carrying an efficientcentrifugal exhauster D The external air at ordinary temperatures isdrawn inward through the unobstructed annular space between the exteriorsurface of the shaft D and the inner surface of the pipe B. The air isdrawn in a thin but steady stream into the center of theexhausterchamber, conveying with it the heat which it has absorbed fromthe surface of the shaft. Its open outer end, slightly trumpetmouthed,lies near the nearest bearing A and its open inner end lies near the hubof the exhauster. The air entering through it cools the whole of theinclosed portion of the shaft. An outer pipe B of nearly the same lengthis mounted concentrically around the pipe B, the thin space betweenbeing maintained by slight'spurs 1), extending outward.

from the inner pipe B or inward from the outer pipe B. The function ofthis outer pipe is to defend that portion of theinner pipe B whichextends into the chamber a against the reception of so much heat as itwould otherwise receive from the surrounding gas. The inner end of theexterior pipe will become red-hot. The little space between this pipeand the inner pipe B retards the transmission of heat, and the axialmotion of the air in such thin space contributes to the effect.

Modifications may be made without departing from the principle orsacrificing the advantages of the invention. may be varied. Parts of theinvention may be used without the whole. I can omit the slighttrumpet-mouth at the outer end of the pipe B. The space between theouter pipe B and the inner pipe B may be greater or less The outer pipemay be omitted than shown.

The proportions.

entirely, the inner pipe alone being set directly in the wall A.

In the form shown in Fig. 2 the shaft is a little larger in diameter andhollow, the interior affording a liberal passage through which the airflows with a corresponding effect. When this form of the invention isused, I prefer to provide also a passage for the air on the exterior ofthe shaft, and have represented the pipe B as thus employed. Theinvention may be used with some success with only the air-passagethrough the interior.

I claim as my invention 1. In an exhauster for acting on hot gases, thechamber A, having an opening a in one of its walls, a shaft sustained bya bearing external to and independent of the chamber, said shaftextending through said opening into the chamber and carrying anexhaust-fan, in combination With inner and outer tubes spaced by spurs,the inner being larger in diameter than the fan-shaft to form anunobstructed annular space and extended to also spaced by spurs, theinner being larger in (ii-- ameter than the fan-shaft to form an annularunobstructed space and extended to incase the overhang thereof, theouter end of said inner tube being in proximity to the bearing andflared, substantially as herein specified.

In testimony that I claim the invention above set forth I aflix mysignature in presence of two witnesses.

JAMES M. SEYMOUR, JR.

lVitnesses:

J. B. CLAUTIOE, M. F. BOYLE.

